﻿<blockquote class="extDef">NOTE&nbsp; Definition according to ISO/CD 10303-42:1992<br>
This function builds and returns three normalized orthogonal directions.
u[3] is the direction of axis. u[1] is in the direction of the
projection of ref_direction onto the plane normal to u[3] and u[2] is
the cross product of u[3] and u[1]. Default values are supplied if
input data is incomplete.</blockquote>

<blockquote class="note">NOTE&nbsp; Function adapted from <strong>build_axes</strong> defined in ISO 10303-42.</blockquote>

<blockquote class="history">HISTORY&nbsp; New function in IFC1.5</blockquote>

